Experiment of Control Blasting with Water Jets Slotting

Use similar material and system of caustics to simulate the characteristics of fissure distribution and dynamic vacation regulations of fissure generation and expansion, whose fissure is made by plexiglass jet slotting and blasting under the condition of explosion. We have analyzed and compared the expanding length and velocity of main fissure’s point and dynamic intensity factors between the holes of ordinary blasting and water-jet slotting; and discussed the dynamic effects of slotting blasting. The study shows that, with the same explosive quantity, the fissures of common blasting hole distribute randomly around the hole with large quantity but with short fissures and the caustic spots have small diameter and distribute with fissures; while the fissures of jet slotting hole blasting are longer and distribute mainly along the fissure’s direction, the caustic spots are clear and mainly concentrate among the fissures with lager diameter. That is to say, the jet cutting blasting energy concentration can improve the effect of rock damage. The existence of jet seam has a guidance quality to rock breakage. Main fissures take place and expand from the direction of slotting seam while the distension along other directions is heavily weakened in the process.